Across 2. the first most important thing every student should be (according to Wells) 4. a group of the same type of organism living in the same area 5. the second most important thing every student should be (according to Wells) 8. living things, such as plants, animals, and bacteria 12. a scientist who studies the interactions of organisms with each other and their environment 13. a population that eats organisms from another population 15. a model that shows what eats what in an ecosystem 16. the ability to make things move or change 18. a population that is eaten by organisms from another population 19. a molecule that organisms can use to release energy, and that is made of carbon, hydrogen, and oxygen atoms

Down 1. when two or more populations use the same resource, such as the same food source 3. a molecule that organisms can use to release the energy they need to survive 6. a small part that is meant to show what the whole is like 7. the result of one cause leading to an effect that causes one or more other effects 9. the third most important thing every student should be (according to Wells) 10. a group of atoms joined together in a particular way 11. the process of creating offspring 12. all the living and nonliving things interacting in a particular area 14. when something stays mostly the same over time 17. when something becomes different over time